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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5447eb861af46e74a9f25681505edc4e8642a4bfa4ca07becc0094284e0f32f2' 
  AND token = 'nAt9dzZbPnfffzJik1Jq4rtyoLRn7D4lmwlXh1r/BBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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