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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e04adcf957620b295367170df052210bc67ca970d41d0a4414557ea2f8531a7' 
  AND token = 'F33puaF+OvWCaqxRauXaoBYRNLKU7xAVOzMeXdoexgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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