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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cabdff63f879716a9034a2b6e24c1c2adfe9ef7228811050d1710dc8f65d840b' 
  AND token = '8d2Sk3T0w+mQOxz4MQomVUhk5JEpxOl0DTb9pzQoIEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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