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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68bea6f6318af343a196bb2a052bbc70042035a56c4a828c41a701c8d6acd8f1' 
  AND token = 'OS/osk2+RAvSS9b9v24bvLMg4LcB7uEumW1wfVZtXpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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