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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ddcef3c561120cf6fe58f0a4dca992e607fe409b839ef0a0bfabae79f50c31' 
  AND token = 'UFdgy7bmvWN8hOuZIIB++ylQOK5Lg6QFmSN+Jd/ar9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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