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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0fe768bbef1533e64a6f857e3acb7a32b5e91de48a86cf71f7c31d9cf9af888' 
  AND token = 'ZW0+AhRT6c63zX/ww/Jk6gZADTZuwPCdufhHcg6I3I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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