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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '752e4186867c8c7b74a34c3dd315a31ecf742e78714341f8cda086c9dc431871' 
  AND token = '4vUYo7cCkV5VOc9wZWx+mFKj/VsC4Kfdu8Ig7skc+Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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