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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdf3fca45e874949dadc10092e2783652c858bf1b6ba7c55adc6ddb4bebb900a' 
  AND token = '1uiN8PCs12yeUSTsbnkdPrEB5/PqEQWcss86jQndw5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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