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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2228d8692fe895eb4e3bbc66285afc9409f2adc5b558f4240b99c5bc2e7e7f17' 
  AND token = '9adXtezzZT/5u15Kq/fM2gT+qi/lcEfqrio43G+dyg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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