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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f81ec55466b8a2ec118b973ddc5cb25fded078098e05be0814c3da786a0dd19' 
  AND token = 'I2avL6hbmjtD89/XiJWAZccPWxWH7EBVXfHua2nbBBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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