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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec10180192b0aa14c0aa7220e8afd2b440aa3fee719596c8d5687cff083f2a6c' 
  AND token = '0fH13nKSDdsgQY0nkUyFwsnwiAwUZt55CZGVGVocq88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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