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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1aa5cfb58c651e1d1cbb6d189b012ac07a9c40134cc8d224312eb2643ced7e94' 
  AND token = 'Pq7vPiVe4cgm62rW5cLpCA3PY0423SLQhGt81uSLCJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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