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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a52d6a11049d04e0c297fc1df4591e0639627e6e613342573dc7e9aaa2d4155' 
  AND token = 'IXsS5yD570oBdr2aljU3NcR73WdVccfMoT5iHufqie0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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