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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9865a2358f4ab1d31fda7af201dc8e25f80639e43d3b6d2a1443a3905275c02c' 
  AND token = '+5rNugEtYxnEe2t6AapMx6L9MdbghvtbMrPLdAYXiJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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