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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66c80e683501804d1e5b66415f30948b2ed4dd7eccb40cffab34eef072215fd3' 
  AND token = '2ZRn3GOdnBSLIYDvVai33x9vCcm7PoI3mZvRf81DQ4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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