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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27399837a45e2e9724489537c96e62d68225884a3ea11a2e1a138bee3754ba31' 
  AND token = 'EgJqeS3Qj1Eca0JD6/mRLd1Cbnbd2X9tOOhsNBl0/wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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