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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed7243fe567db1737b11dffb7eb5b99baa99fae379057de77e7cc9b60b727bd6' 
  AND token = 'ouJ+wJS6dPRtRo1tFR3OT9L6ymwXPfKXn63J9aZF7kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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