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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31917a6f4bfb506abdfe516afea4156c2ec20dface2beab5902229544582ac85' 
  AND token = 'fvz4I01BuF/LBucwls8GALRFkAi48NfP8i9Ym4lJ/0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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