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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68367414b0b5057bc1f0fa862d7570ac816de9b9e5e73e91506be02adcdfb288' 
  AND token = 'iN6fx/ex0sKmi2B2dZEaMthpFqog0hUyw2BI4sh/aIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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