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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24d7feb9b810e0904e60963ca7cde547b86b2c0f7fa09ec4f7f43c91b4dce2e6' 
  AND token = 'OYAChhBo/jpJ7EVDWGSsmP9D9Vgjk1xW0k603BJj4uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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