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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ae4c7fee376d0818f63a7ec96fe2090435b1b6c1660759f4947f49c7ae66b79' 
  AND token = 'xDfMQVK31S4bIRWIPjF+iF1FXmatlBo15+ucfmBIZiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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