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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6edba71be1f6ed249338fa566013fc80312c24699f323abc03449b958879144c' 
  AND token = '8ciT/UEHergfzDcI1kE/t+cW9ZOaJ6Bc8xRuVfF7HDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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