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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ed5576216cbab9d281259da1bebe5992fd0d13b4e1dd77e1a159f467bd79f02' 
  AND token = 'XqnXYR42Ne2XUtU7r1JAr+DJMsabSfCDCT4j8K2GVes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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