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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1b69dc02edfe113ecd803414403c7da2d1ae0887e8e9f7218fc07c01ed1cad1' 
  AND token = 'kApPb2Bv0CNxVwNPjFkdOwdeYXZyY40mZvKjXJQeHfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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