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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '141a27d1a8fdaaced0a939e91f9d60c2d808d0c59220f04fed5f73afd02548c7' 
  AND token = 'NsclHljtLZiCdz/qL74kGrXnz4pzTl0zvHkRylJo42c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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