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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d1998e21cedc12c4ca1e10b2bedf86f31edf54c26617aa832f92bb5b5a2c5a3' 
  AND token = 'wQndOtTrNCfbTEH3tcIImEUt5+//0mC+Y6R00GBbrmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}