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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cd795eeeb313080aa984a6d4fca13c0ec8eb0156ebf45862737e9fec50e6170' 
  AND token = 'XJKskEhxJ6ECvMDkh1IhJtQyzIc9tUHx7Ifdxwf/ezM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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