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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a81104f720262fdc800abd2d286eccaa55765a9acdbef1c4905aebeb1447fff0' 
  AND token = 'gKpjivpzi1I1cFJgF9Ft7n7OtLbiye+l0s6dNDph00Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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