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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbf4f43702a48b02fb7f841446d6f7ab7ee41c9d49071594eff8cc37e50dc19d' 
  AND token = 'ucDPNBttDS5qsnX+e1lqpVjWGBbzHTT/TqT3INiW4es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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