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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2da52cc44850676e24a0a98588bd877bdaa6322ebcd0297b6cfe5805b0ca06a' 
  AND token = '8+6W0ZrQPws6KQhwJFRQMDf/2N7ATszMinPpZ3edwuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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