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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a416133a17e60f54aac9a54dc9e6ec2a43bb19af96d4b162ce8086c95871177' 
  AND token = 'iFTqZRL6jbeTEHjk/KEJrXlkRFKguK7Omv91CXXMAD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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