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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ee5a07cc4d202c9ce7fc8beae736aa95385fe6ff3a7965fbd61b517458db2c9' 
  AND token = 'DnK9l4m03X4YDCHC0XNV+Rq/wXUXLpsyN/lM59XJbWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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