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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '583480175dd22f2108fbe2695cc5afaafed2e1ec784a2cacac0a56e8bca466c6' 
  AND token = 'KhcRuIXT3syjx7X5wdw9/Wz2615vOdBVmaj8/WXCh14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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