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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb9531264f8243bdae3a9ff73f1cf2460c80270f8879fe312a44630c7024ccf1' 
  AND token = '3GH786DmCMSEZojmvBmz58Wg64skA7mnla5uck9Wz/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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