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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8d0a1f57cb2cd389ba993e9b2d1ff906081e129816ec0846d1bd24d9154ba3a' 
  AND token = 'aJH47gP1oojAw/bf8zDbQ183fnNyAV+/IuIDVoMd4hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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