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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2d3a186eff60aa9dd07f6f6e47168b145c3b9d63ec858d8cf68647b27244ecb' 
  AND token = 'RBOiFCf2jxR71yhKg+aErRe6ZBlwWxgbz8WthxxjnuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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