Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cee55e9f865206a12c948f11ae965743174256dc8c33a467ff4013e70e886fe' 
  AND token = 'B5g3c+355qLzZrRdEto2LaLeV4RgtHW02av02bTeJGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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