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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7d112476a268999743514e8bf63409418d09c905fd0367a123823b29f3719ed' 
  AND token = '9c3Yl8kri38RFolbVzPI475tlCVeFeuQVZgK9c+2wUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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