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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8fea92401effc81a78ec6e759d012eb940b936780b2880aa0601e2c0227e3bf' 
  AND token = 'I6895YKqs/whpgfWK7AJ1HgszHElbCyAbb6O7wxWZx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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