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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '925e01b903d019bda9ea571598f9bbd0fe752733e17bb5f890c9e9ccca9054f7' 
  AND token = 'QqSUDiHrWK4U1ezmCt8gY6y8U4J1fayel0dQ6ZwaIVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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