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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6695ee1f2f6e0cba3657faaa07ae12685b39004446ee36f452d4f039dfc3efda' 
  AND token = '1JZ+zTRIUS6Axr4O/sVoT1XavSspSg5xBXsB/nAyGg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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