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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41ec46a0d1d375d6fefc5b366cbf9c271c9b239af13050b085b5ff76fc3e166a' 
  AND token = 'fDz9f2Gan3mOd2Wl6qiqF75uE6UsjcXhaNpZ3wnYRPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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