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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39586ddff2c13d7f403bbe27382067b91e8aef8b62c82dce1bf3311139271d29' 
  AND token = 'wwx+86PCycpk14tUVnazoc5NqQiVvYUc9caufax47nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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