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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd79e011078d9e4603a452713057a479d20680e6466b861b132d6a0507a6d4c75' 
  AND token = 'Ao+p6hX8AEByVykjD8slmm9c/edAQ4E3p9UlzJB2ob4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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