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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db978fbbb316c350f121246e7797afb668e1fc95aab511c7e0fdd2bfd9094f73' 
  AND token = 'I1ooxE/uC8tt8yzMEqcez+nDT8yvuAkypVdwZ91NJaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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