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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd99d9e8e82c41914f0f29391b3bc2c3e1ecce6a8b4c19d9c9b0ec304a3b30495' 
  AND token = 'EsAzSo0BM5bRyNtceD4gVrkX6sh1iADbUeBLQtTm+BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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