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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51565fa83a0ef7073260da4a35801e9c64677715ab72c56ec5077d467e676270' 
  AND token = 'WdRJUiz6LolsKN0U/hp7ZhfjdJ3ca7GYiRMXr6NH4O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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