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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5752635ecc52a89f7f7f011f81bae30c4568c1384dfed4e66bd178a44178ccc' 
  AND token = 'mkdIBIzLKt5+TRJedt84CTRPEh2kA5NiQ094d5zQiuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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