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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f6c4d9b48dbf80ed1f014b70a8e53f6bc9340643049b89cd802d8bad96f6a7b' 
  AND token = '3syF5c8G5sp1I9Krq50XG83MSX1/sAu2zZIWmeQK+Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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