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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd07b6afe6e276e0907c0e8413782d4de360db31330bf6eca07e0df46c70f658' 
  AND token = '3I43mqGl+NyOGEw42f0BgXqIASagSSFbisBkeg5o/yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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