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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efa9410d15a4d9c1f5153cfb8bcc5e95edf714b8d21c2736a34efacedd0adbb3' 
  AND token = 'MykTOTIodImb5gFVIhhUBN5WjwCbKPAZq+MEoV+NLPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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